package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import org.springframework.data.redis.core.StringRedisTemplate;

import java.util.concurrent.TimeUnit;

/**
 * @ClassName SimpleRedisLock
 * @Description redis实现分布式锁
 * @Author guobenqi
 * @Date 2022/4/23 21:48
 */
public class SimpleRedisLock implements ILock{
    private StringRedisTemplate stringRedisTemplate;

    private String name;//锁名称
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString(true)+"-";

    public SimpleRedisLock(StringRedisTemplate stringRedisTemplate, String name) {
        this.stringRedisTemplate = stringRedisTemplate;
        this.name = name;
    }

    @Override
    public boolean tryLock(long timeoutSec) {
        //获取线程表示
        String threadId = ID_PREFIX+ Thread.currentThread().getId();
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX+name, threadId, timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
        String threadId = ID_PREFIX+Thread.currentThread().getId();
        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX+name);
        if (threadId.equals(id)){
            //释放锁
            stringRedisTemplate.delete(KEY_PREFIX+name);
        }

    }
}
